One person with whom I've emailed before said to "drop me [them] a line". I always thought the intention of this phrase is to call the person, specifically by phone (via telephone line). It seems this person means to email them. I do think it's possible they mean to call them. Is it a widely accepted use of this phrase to mean "contact me" in general? Is this usage common among certain groups of people? Am I wrong in associating this with phones in particular?

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Originally a line meant a line of written text that you'd drop in a mailbox. It very well could be used more generally today to mean contact me, but email seems a more likely medium than telephone- IF they wanted you to call, they'd have said, "Call me sometime."
– JimSep 2 '14 at 21:14

"Is it a widely accepted use of this phrase to mean 'contact me' in general?" Yes.
– CaseySep 2 '14 at 21:22

1 Answer
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In the U.S., I think I'm safe in stating that, in the vast majority of cases, 'drop me a line' implies written communication, and never implies calling via telephone or any other means. Before the Internet was invented, 'drop me a line' always meant 'write me a note/postcard/letter'. Nowadays, the phrase could also imply emailing.

I can't speak for British English, or for speakers from other parts of the world.